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1. FOLEY. Balancing Millstones.

No. 68,865. Patented Sept. 17, 1867..

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IMPROVEMENT IN BALANCING MILLSTONES.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN FOLEY, of Cleveland, in the county of-Guya-hoga, and State of Ohio, have invented certain new and usefulImprovements in Balancing Millhtones; and I do hereby declare that thefollowing is a full and complete description thereof, reference beingbad to the accompanying drawings, making a part oi. this specification,in which- Figure 1 is a side view of the stone.

Figures 2 and 3 are enlarged sections to which reference will be hadhereafter.

Like letters refer to like parts in the several views.

A, fig. 1, is the millstonc, and is mounted upon the spindle B by a bailand spindlc-hcad, as in the ordinary way. 0 is a drum, and D a belt bywhich the stone is driven. Eis a section of frame, supporting thespindle and stone. F is a hoop or band surroundingthc stone. G G arebalancing weights attached to the band, and

diametrically opposite each other. These weights are ad ustable, and areconstructed as follows: a, figs. 1 and 2',

i is a stay, the upper end of which is bent at right angles. The secondangle is turned outwards and bolted to the hoop; the lower end isalso atright angles, the second angle being turned inward and inserted betweenthe hoop and stone. 1) is a screw, thclower end being secured to thestay, the upper end passing through the stay and terminating in a squarefor the purpose of working it. c is the weight, and is placedbetweeirthe stayand' stone. The screw passes through the weight, by themeans of which it is raised upward and downwardfor the purpose hereaftershown. This raising and lowering the weight may be accomplished inanotherway, as shown in fig. This consists of a yoke, d, which is passedbetween the hoop and stone. e is a red; the lower end being fastened tothe end of the yoke, the upper end projects through and is secured by anut-,f. gis the weight, and slides up and down on the rod. The innerside of the weight being of a quicker curve than the stone, it thereforetouches it only at the ends, and is made by this means to actas .aspring, the pressure of which prevents its falling when raised up. It isa. well-known fact that millstoues when .firsthung are not equallybalanced, the did'ercnce in the specific gravity of the blockscomprising the stone being mainly the cause; hence it has been foundnecessary, in or tler to remedy this defect, to balance the stone byloading the light side with lead or other material of a saitablehature.For this loading we substitute the weight referred to,

as follows The tendency of all rotating bodies is to bring the centre oftheir greatest specific gravity in a level at right angles with the axisof rotation; hence should the greater weight of the stone be at the topat the point,

Jr, the stone in revolving would drop in the direction indicated by thedotted lines it, until thepoint of its greatest weight or mass reachesthe line passing through the point or centre of rotation indicated bythe horizontal dottedlinej, and would continue to revolve in thisposition, though when it was atrcst, it would be in the position shownin the drawing, equally balanced in the fact of its gravity. 01,011 theother band, should the greatest weight be at the other side at it, thestone on revolving would rise up in the direction indicated by thedotted lines It, until the point of its greatest weight or mass reachedthe horizontal linej, as in the former case, and would remain in thisposition as long as it continued to revolve; hence the face of the stonewould not be parallel with the line of rotation, which it should be. Inorder to prevent this deflection of thcface of the stone in itsrevolution, and cause it to rotate in the plane of the lower one, theweights above described are raised or lowered toward the line ofrotation, as the case may determine, and in this way the weight isbrought in a. line parallel with the face of the stone, which is also inthe line of rotation hence by this means the nicest degree ofequilibrium is obtained without in the least disturbing its centre ofgravity. We here remark that the weight g is hollow, whereas theopposite one is solid. The reason for making the weight, hollow is inorder that it may he graduated to the unbalanced condition of the stone.This is done by adding more or less to the weight by placing it in thehollow or chamber of the weight, 'as the condition of the stone maydemand. Were the weights equal, the balancing of the stone could not beso nicely adjusted as in this way, forboth acting conjointlywc arethereby enabled to balance the stone to the least possibledegree. To aidin securing the weight at any point on the rod, a sct-scrcw, h, isprovided, which effectually prevents the weight from slipping.

What I claim as my improvement, and desire to secure by Letters Patent,is-- The employment of the solid and chambered weights 0 g, with theirrespective devices for adjusting them, applied externally to the hoop F,the whole arranged and operating in the manner and for the purposedescribed JOHN FOLEY.

Witnesses:

W. H. Bummer, FRANK. ALDEN.

